CS - 601 || CS -601 Quiz # 2 Solved by Vicky Lab || CS601 2020
Analog-to-Digital Conversion
o We sometimes need to digitize an analog signal
o To send human voice over a long distance, we need to digitize it, since digital signals are less prone to Noise
o This is called Analog-to-Digital Conversion or Digitizing an Analog Signal
o This type of conversion requires a reduction of potentially infinite number of values in the analog signal so that it can be converted to digital bit stream with minimum loss of information.
Pulse Amplitude Modulation
o First step in Analog-to-Digital Conversion o This technique takes an Analog signal, Samples it, and Generates a series series of Pulses based on the results of Sampling o Sampling means measuring amplitudes of signal at equal intervals
o PAM uses a technique called Sample & Hold means At a given moment , signal level is read, then held briefly
o The pulses are of any amplitude (still analog not digital). To make them digital, we need PCM
Pulse Code Modulation
o Modifies pulses created by PAM to a complete digital signal
o Four Separate Processes:
PAM
Quantization
Binary Encoding
Digital/Digital Encoding
Quantization PCM’s first step is Quantization
“Quantization is a method of assigning integral values in a specific range to sampled instances”
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